Patent GB-158266-A (GB)
Title: Improvements in carburetters for internal combustion engines
IPC: F02M7/28
Filed: 1921-01-18
Abstract: 158,266. Viel, L. L. Jan. 23,1920, [Convention date]. Spray carburettors.-A tubular part 31, Fig. 1, is screwed into the carburettor casing 33 and has screwed on to it another tubular part 25 closed at the top and surrounded by a tube 27 which forms an annular space 28. A row of holes 29 is situated at the fuel level y-y, and another row at 30 some distance below the level. An inner tube 34, integral with the part 31, extends above the fuel level and is open to the atmosphere through uncontrolled orifices 37 and an aperture 35a controlled by a suction-actuated coned plug 36. Fuel reaches the spraying-orifices by way of passages 38, 38a. At starting, the fuel above the orifice 30 is drawn out, after which an emulsion of fuel with air from orifices 37 is discharged. On an increase of suction, the plug 36 is raised to admit additional air through the aperture 35a. The air-fuel ratio is therefore automatically corrected. The emulsion from the orifices 30 is further broken up by air through the holes 29, and still further by air entering the choke tube. Specifications 25725/12 and 8894/15 are referred to. The Specification as open to inspection under Sect. 91 (3) (a) describes a modification in which the holes 30 and the reduced upper portion of the tubular part 25 are omitted. It describes also the following :-The fuel from the float chamber 1 passes into the channel 38 through a calibrated hole 12<b> in a conical plug 12, which is forced to its seat by a spring 14 in a tube 13 secured by a bayonet-joint comprising a tube 17 and recess 18 to facilitate removal. The tube is located in a well 15 communicating with the float chamber through a large aperture 15<a>. In a modification, the hole 12b is adjustable by a hand-actuated needle valve carried by a part which replaces the tube 13; in Fig. 4 (Cancelled), the needle valve is shown as being arranged to be actuated from a distance by means of a lever 59, shaft 24 and cam 23. The cam may be moved to one side to facilitate withdrawal of the fuel-control parts. The slow-speed or by-pass device comprises a tube 41, Fig. 1 and Fig. 8 (Cancelled), dipping into a well 55 and provided with an air inlet aperture 43. The tube is carried by a hollow plate 40 which communicates with a mixing-chamber 44 which delivers into the induction passage 26<a> through an aperture 45. Air may be admitted to the chamber 44 through a passage 46 controlled by a valve 47 and also through a passage 48 controlled by the spindle of the throttle valve 49. Air, to provide the slow-running mixture, may also be admitted direct to the induction passage through a passage 50<a> controlled by a valve 50. To obtain an excessively rich mixture, the well 55 may be provided with a valve 56, Fig. 4 (Cancelled), loaded by a spring 57 and actuated by a cam 58 on the same shaft as the cam 23, the cams being suitably arranged as regards sequence of action. Closing the valve 56 causes fuel to rise in the well and to issue through both the apertures 42, 43 into pipe 41. In a modification, the passages from chamber 44 open both above and below the edge of the throttle valve. The float chamber, Fig. 6 (Cancelled), is of vertical section vertically and comparatively flat laterally. The float 2 actuates the valve 4 through a fork 5, the valve having flat parts on each side of the collar 8. By rotating and removing a plug 9 and thus at the same time rotating the valve 4, the latter may be withdrawn through the fork. The disposition of the float chamber is stated to maintain a constant level at the sprayer irrespective of inclination. In a further modification, an horizontal type of carburettor is described, the float chamber serving as a baffle to direct the air into the intake. This subject-matter does not appear in the Specification as accepted.